The different BTZ aircraft designs using annular wings were generally given names of various beetles. Zborowski envisioned applications to private and business aviation, medium size cargo and passenger transports, supersonic fighters, ground attack aircraft, remotely piloted vehicles and missiles

Begin of the Hanneton ("cockchafer beetle") project 1958.

Hanneton 1S

Tail Sitter

Power: twin turboshaft engine Propellers: two co-axial counter-rotating two-bladed propellers operating within a very large shroud Capacity: single seat 3-side-view

BTZ 511-07 Hanneton III-A

Tail Sitter

Four flaps at the trailing edge of the ring duct were used to vector the propeller efflux for control in hover and cruise. Between each deflector was a landing gear. As a result of the anticipated difficulties in landing the aircraft when the pilot would be unable to visually see where he was landing, an electronic ground height sensor and warning system was also to be designed Power: two Turboméca Artouste III turboprop engines Propellers: two 3.9 m diameter large three-bladed counter-rotating coaxial propellers Maximum Speed: 600 km/h (325 kt) Maximum Altitude: 5 km (16,400 ft) VTOL Range: 1800 - 2400 km (970 - 1300 nm) Length: 5 m (16.4 ft) Height: 4.2 m (13.8 ft) diameter Empty Weight: 1300 kg (2866 lb) Maximum VTO Weight: 2600 kg (5732 lb) Capacity: five passengers (plus the pilot) (520 kg) in paired seating that swiveled with the aircraft orientation (meaning that they would be staring at the floor for take-off and landing!) 3-side-view

Hanneton 7C

Tail Sitter

Power: two Turboméca Turmo III turboshaft engines at the rim of the duct Propellers: of dual ducted propellers Capacity: seven seats 3-side-view

Hanneton 20C

Tail Sitter

Capacity: 20 seats, including crew in two fuselage. 2-side-view

BTZ 511-16 "Scarabée" ("Scarab")

Tail Sitter

Designed for observation, anti-submarine warfare and ground attack. Power: four 1000 hp Turboméca Turmo IV or General Electric T58 turboshaft engines, behind the cockpit Range: 600 km/h With a 500 kg useful load, the Scarabée could fly for more than 6 hr and reach 220 km at 430 km/h. Propellers: Each engine pair drove a counter-rotating two-bladed propeller Empty Weight: 3,530 kg Maximum VTOL Weight: 7,300 kg Payload: 3,770 kg Capacity: two seats, have swiveled from the vertical to horizontal positions 2-side-view

Twin	?Tilt duct?

A twin-ducted propeller design was also studied for civil applications. Power: two 1000 hp turboshaft engines housed within the center of each duct. Propellers: four-bladed propeller in each duct, rotating in the opposite direction. 2-side-view This concept was found to be too difficult to keep the passenger cabin horizontal.

BTZ 511-17 "Lucane" ("Stag-Beetle")

Tilt duct

It used a single duct with two swiveling cabins. Power: four engines were contained within the center nacelle Crew: 2 Capacity: 16 passengers 3-side-view

Bruche A

Tilt duct

The design based on the Charançon concept and designd as a light ground attack fighter. Two Versions: first the pilot stand for hover (or lay for cruise) second the pilot seated in cruise flight (it used a much wider centerbody) Power: Atar 101 Maximum Speed: 900 mph Length: 27.5 ft Height: 8.5 ft diameter Capacity: 1 person 2-side-view

Sources:
• The V/STOL Encyclopedia Series: Volume 2 French & Italian 10 December 2002.